Azo compounds containing a 2,6-diaminopyridine coupler component

ABSTRACT

in which D is the radical of a diazo component; E is hydrogen, unsubstituted or substituted alkyl or phenyl; Z is cyano or carbamoyl; R is hydrogen or an unsubstituted or substituted aliphatic, araliphatic, cycloaliphatic or aromatic radical or two radicals R together with the nitrogen atom form a saturated heterocyclic ring; and N IS 1, 2 OR 3. The dyes are eminently suitable for dyeing natural and synthetic polyamides and give bright yellow to violet colorations having excellent fastness properties. Azo acid dyes which contain one, two or three water-solubilizing sulfo groups and which, in the form of the free acids, correspond to the formula (I):   D R A W I N G

United States Patent [1 1 Dehnert et al.

[ -Sept. 23, 1975 1 AZO COMPOUNDS CONTAINING A 2,6-DIAM1NOPYRIDINE COUPLER COMPONENT [75] Inventors: Johannes Dehnert; Gunther Lamm,

both of Ludwigshafen, Germany [73] Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft, Ludwigshafen (Rhine), Germany [22] Filed: Mar. 28, 1973 [2]] Appl. No.: 345,507

[30] Foreign Application Priority Data Apr. 16. 1972 Germany 2216570 Feb. 22, 1973 Germany 2308663 [52] US. Cl. 260/156; 260/154; 260/205;

260/206; 260/196; 260/207; 260/207.l; 260/246 B; 260/247.56; 260/293.63; 260/293.69; 260/294.9; 260/295 L; 260/295.5 A; 260/295.5 B; 260/295.5 T; 260/296 R C09B 29/36; C0913 31/14; D06P 1/38;D06P1/39 [51] Int. Cl

[58] Field of Search 260/154, 156

[56] References Cited UNITED STATES PATENTS 2,068,353 l/1937 Schneiderwrith 260/156 2,145,579 1/1939 Binz et al 260/156 2,148,705 2/1939 Mietzsch et al..

2,681,906 6/1954 Granatek 260/156 3,531,457 9/1970 Ackermann et al. 260/154 3,531,458 9/1970 Ackermann et al. 260/154 FOREIGN PATENTS OR APPLICATIONS 270.987 12/1950 Switzerland 260/156 Primary ExaminerF1oyd D. Higel Assistant E.raminer-C. F. Warren Attorney, Agent, or FirmJohnston, Keil, Thompson & Shurtleff [57] ABSTRACT Azo acid dyes which contain one, two or three watersolubilizing sulfo groups and which, in the form of the free acids, correspond to the formula (1):

E (so ir) DN= Z I j R-N N gI-R in which 8 Claims, No Drawings AZO COMPOUNDS CONTAINING A 2,6-DIAMINOPYRIDINE COUPLER COMPONENT The invention relates to dyes which in the form of the free acids correspond to the formula (I):

11-? N \NR R R in which R l N-R may be for example pyrrolidine, piperidine, morpholine, piperazine or N-methyl-piperazine The invention relates particularly to dyes of the formula (Ia):

in which D, E, R, n and Z have the meanings given above.

Examples of radicals E (in addition to hydrogen) are ethyl, n-propyl, isopropyl, n-butyl, isobtuyl, pentyl, a-ethylpentyl, phenyl or methylphenyl, and preferably methyl.

The radicals R may be identical or different. They may be for example (in addition to hydrogen): alkyl of one to eight carbon atoms which may be interrupted by oxygen atoms and may bear hydroxy, acyloxy, alkoxy, cyano, cycloalkoxy, aralkoxy or aroxy as substituents, cycloalkyl or polycycloalkyl of five to fifteen carbon atoms which may bear hydroxy, chloro, hydroxyalkyl, chloroalkyl or alkyl assubstituents, aralkyl of seven to 15 carbon atoms, or phenyl which may bear hydroxysulfonyl, chloro, hydroxy, alkoxy, alkyl, hydroxyalkyl or hydroxyalkoxy as substituents, or alkenyl, pyrrolidonyalkyl or carboxyalkyl.

The radical D of the diazo component may be derived particularly from aniline, aminophthalimide and aminoazobenzene derivatives which may for example bear hydroxysulfonyl, halogen, alkyl, alkoxy, acylamino, cyano, alkylsulfonyl, phenylsulfonyl, nitro, carboxyl, carbalkoxy, carbamoyl, N-substituted carbam- RHN oyl, sulfamoyl, N-substituted sulfamoyl or benzothiazolyl as substituents.

Examples of individual substituents in addition to those already specified are: chloro, bromo, methyl, ethyl trifluoromethyl, methoxy, ethoxy, methylsulfonyl, ethylsulfonyl, carbomethoxy, carboethoxy, carbo-B- ethoxyethoxy, carbo-B-methoxyethoxy, carbobutoxy, carbo-B-butoxyethoxy, N-methylcarbamoyl, N- ethylcarbamoyl, N-propylcarbamoyl, N- butylcarbamoyl, N-hexylcarbamoyl, N-B-ethylhexylcarbamoyl, N-B-hydroxyethylcarbamoyl, N-B-methoxyethylcarbamoyl, N-y-methoxypropylcarbamoyl, N,N-dimethylcarbamoyl, N,N-diethylcarbamoyl, N-methyl-N-B-hydroxyethylcarbamoyl, N- phenylcarbamoyl, carboxypiperidide, carboxymorpholide, or carboxypyrrolidide and the corresponding sulfamoyl substituents, acetylamino, propionylamino, butyrylamino, methylsulfonylamino, phenylsulfonylamino, hydroxyacetylamino, benzoylamino, pchlorobenzoylamino, phenacetylamino and the radicals of the formulae CH CH CH; CH;

Examples of individual radicals R apart from those already mentioned are:

l. unsubstituted or substituted alkyl: CH3, C2H5, n-C3H iC H7, n-C H i'C4H9, C5H13,

CH CH OH, (CH OH,

CH CHOH, CHCH OH.

the corresponding radicalsin which the grouping 2 4 a OCH CH OH sou-i sc n The following are examples of preferred substituents R: hydrogen, CH C H n-C H iso-C H n-C H iso- I Q 6 l3 CH2'CH2'0H 2)3 s cu HOH. i...

( ZL 2)6' v CH H CH; (CHZL. N (n 2, 3, 6).

CH CH QCH CH CH OC H CH CH OC H Da a z)3 z 5, z)3 a 1,

( zh -1 9. 2)3 6 l3v zh a m in the form of the free acids or conveniently as watersoluble salts, for example as alkali metal, ammonium or substituted ammonium salts. Examples of substituted ammonium cations in the salts are trimethylammonium, tris-B-hydroxyethylammonium, methoxyethylammonium, hexoxypropylammonium and dimethylphenylbenzylammonium.

To prepare a dye of formula (I) a diazo compound of an amine of formula (II):

D and/or the compound of formula (Ill) usually containing at least one sulfo group. Diazotization and coupling are carried out by conventional methods. The new dyes, particularly those having sulfuric hemiester groups, may also be obtained by first preparing the compounds devoid of SO H-groups by diazotization and coupling and then converting these with sulfonation agents such as concentrated sulfuric acid, sulfuric acid monohydrate or oleum into the dyes of formula (1). Reference is made to the Examples regarding any details. Coupling components of the formula (III) and their production are disclosed in principle for example Dyes having particular industrial significance are those of the formula (lb):

Z is cyano or carbamoyl; Y is hydrogen, cyano, chloro, bromo, methylsulfonyl,

ethylsulfonyl, phenylsulfonyl, carbalkoxy or SO H; Y is hydrogen, chlorine, bromine or SO H;

Y is hydrogen, chloro, bromo, methyl, carbalkoxy,

2-benzothiazolyl or SO H;

X is hydrogen, methyl, methoxy or SO H;

X is hydrogen, methyl, methoxy or SO l-l;

X is hydrogen, methyl or methoxy;

T is hydrogen or asubstituent; and

R and n have the means given above.

Z is preferably cyano.

Preferred radicals for T are alkyls of two to eight carbon atoms which may be interrupted by oxygen or may bear hydroxy, phenoxy or OSO H as substituents, benzyl, benzyl bearings SO H as a substituent, phenylethyl, phenylethyl bearing SO H as a substituent, phenyl or phenyl bearing SO H and/or other radicals as substituents. Examples of radicals T are CH C H C H ethyl or B-methoxyethyl amino-3-bromo-5-chlorobenzonitrile,

25 (CH2)3O(CH2)4OH, cn cn oc n 011 011 05055,

so r-l and so r! Preferred radicals R in the case of dyes of the formula (la) are alkyl of 1 to 8 carbon atoms which may be interrupted by oxygen atoms and may bear hydroxy, phenoxy, benzoyloxy or 080 11 as substituents, benzyl, p'henl ethyl, benzyl or phenylethyl bearing SO H as a substituent, unsubstituted or substituted phenyl or I hydroxysulfonylphenyl and hydrogen.

The SO H groups may be situated solely in the radical D or solely in the radicals R, particularly where R contains a phenyl radical.

Examples of preferred diazo components are: the methyl, ethyl, n-propyl, isopropyl or B-methoxyethyl ester of 2-aminobenzoic acid, 3-aminobenzoic acid or 4-aminobenzoicacid, the methyl, ethyl or isopropyl ester of 2-amino-3,5-dichlorobenzoic acid, the methyl,

ester of 2-amino-3,5- dibro'r'nobenzoic acid, 3-bromo-4-aminobenzoic acid ethyl ester, diethyl aminoterephthalate, 2- aminobenzonitrile, 2,4-dicyanoaniline, 2-amino-5- chlorobenzonitrile, Z-amino-S-brornobenzonitrile, 2- 2-amino-3,5- dibromobenzonitrile, 2-amino-3,5- dichlorobenzonitrile; 2-amino- 1 -trifluoromethylbenzene, 2-amino-5-chlorotrifluoromethylbenzene, 4-

aminobenzene- 1 -methylsulfone, 3-chl0ro-4- aminobenzenel -methylsulfone, 2-

aminodiphenylsulfone, 4-aminodiphenylsulfone, the B-hydroxyethylimide of 3-amin0phthalic acid or of 4- aminophthalic acid, the B-methoxyethylimide of 3- aminophthalic acid or 4-aminophthalic acid, the butylimide or tolylimide of S-aminophthalic acid or 4- aminophthalic acid, l-amino-4-nitrobenzene, l-amino- 4-acetylaminobenzene, l-amino-3- acetylaminobenzene, 4-aminobenzamide, the N- methylamide, N-butylamide, N-B-ethylhexylamide or N,N-diethylamide of 4-aminobenzoic acid, the amide of 3-amin0benzenesulf0nic acid or of 4-aminobenzenesulfonic acid, the N-butylamide or morpholide of 3-aminobenzenesulfonic acid or of 4-aminobezenesulfonic acid, 2-chloroaniline-4-sulfonic acid, 2-chloroaniline-5-sulfonic acid, 3 -chloroaniline-6- sulfonic acid, 4-chloroaniline-Z-sulfonic acid, l-amino- 3,4-dichlorobenzene-6-sulfonic acid, l-amino-2,5- dichlorobenzene-4-sulfonic acid, l-amino-2,5- dibromobenzene-4-sulfonic acid, l-amino-4-methyl-5- chlorobenzene-Z-sulfonic acid, l-amino-3-methyl-4- chlorobenzene-6-sulfonic acid and the amines of the following formulae:

Ho s

l0 and 15 HO S -N=N NH 20 SO H Examples of preferred coupling components are: 25

The new dyes are yellow to reddish-blue and are suitable for dyeing natural and synthetic polyamides such as wool, silk, nylon 6 or nylon 6,6. Bright dy'eings having excellent fastness properties. particularly light fastness, are obtained with the new dyes.- The solubilitiesare also excellent in some cases.

The following Examples illustrate the invention; parts and percentages are by weight unless stated otherwise.

EXAMPLE 1 One hundred twenty-two parts of the 1:1 reaction product of aniline and 2,6-dichloro-3-cyano-4- methylpyridine (melting point: 135 to 140C) is heated under reflux with 450 parts of n-b'utylamine for from 5 to 9 hours. The excess butylamine is then substantially distilled off, and the hot residue is stirred into about 1,500 parts of ice-water and acidified with hydrochloric acid to a pH of from aboutl to 3. The deposited precipitate is filtered off, washed with water and dried. 144 parts of a colorless product is obtained (melting point: 115C) which is added in portions at room temperature toaboutq450 parts of 23% oleum. The sulfonation mixture is' stirred for from three to four hours at 30 to 40C and then about 11 ,-500 parts of ice, 500 parts of saturated common salt solution and finally 400 parts of 50% caustic sodasolution are added. After stirring overnight and cooling to about 5 to 10-"C, the precipitated product is filteredoff, washed with common salt solution and dried. About .120 to 130 parts of a colorless powder is obtained whicli probably has the formula:

and which contains a minor portion of the byproduct having the probable formula:

CH; CN

Six parts of methyl anthranilate is dissolved in about 60 parts of water and 12 parts of 30% hydrochloric acid. 60 parts of ice and 13 parts by volume of 23% sodium nitrite solution are added. The whole is stirred for about thirty to forty-five minutes at to C, any excess of nitrous acid present is destroyed as usual and the diazonium salt mixture is added to a solution or suspension, cooled to 0 to 5C, of the abovementioned sulfonated coupling component in about 400 parts of water and parts of 30% hydrochloric acid; the mixture is stirred for 30 minutes at 0 to 59C and then sodium acetate solution is added until the pH of the couof the probable formula:

is filtered off and dried. About 20 parts of an orange powder is obtained which dissolves in water to give an orange color and dyes polycaprolactam cloth clear full yellow shades having very" good fastness properties.

The color of the dyeing on wool is yellow.

EXAMPLE 2 7 14.3 parts of the diazo component of the formula:

in a mixture of about parts of formamide, 10 parts of 30% hydrochloric acid and 0.5 part of an emulsifying agent is added. The coupling mixture is neutralized to a pH of about 4 with 50% sodium acetate solution. After coupling is over the dye formed is precipitated by adding about 100 parts of potassium chloride and filtered off ahd dried. v

About 20 parts of a dark powder of the formula:

SO K CH;

c N l I o is obtained which dissolves in water with a reddish violet' color'and dyes polycaprolactam cloth bluish red shades having very" good fastness properties.

Dyes characterized in the following Table by their diazo andcouplin'g components can be prepared by the method described in Examples l and 2.

NH-CHz-CHz-OH are added at room temperature with efficient stirring to about 120 parts of 100% sulfuric acid. The whole is stirred overnight at 20 to 30C and the mixture is then poured onto a mixture of 500 parts of ice, 100 parts of 50% caustic soda solution and 50 parts of potassium chloride. After cooling to 0 to 10C the precipitated dye is filtered off. It has the formula:

Dye

-Continued No. Dye Shade C cu 48 N=N C NH-@ yellow NH-CH CH CH OSO Na C N H C c N 49 Cl@-N=N -NH@ H l\l-lCH -CH CH -O-SO Na COOCH CH CN 50 o h o NH--CH CH CH -OSO Na CN H;,C CN 51 Bl'-@N=N C NH@ yellowish red 8 NH-Cl1 CH CH -OSO Na cu 52 N=N@ N=NNHCH CH CH OS K reddish orange 1 NH S0 K EXAMPLE 53 Twenty-four parts of the diazo component of the forin 10 Parts of hYdTOChIOI'iC acid 250 Parts of mula: ter, 0.5 part of an emulsifying agent and 150 parts of fonnamide. The coupling mixture is stirred for fifteen N minutes at 0C to 5C and coupling is then ended by NH adding 30 to 50% sodium acetate solution until the pH 5 of the mixture is about 3.5 to 4.5. 150 parts of sodium c 503" S03" 40 chloride is then added, the whole is stirred for about is dissolved in a mixture of 150 parts of water and about 6.5 parts of 50% caustic soda solution. Then 12.5 parts by volume of 23% sodium nitrite solution is added, the whole is allowed to cool and 150 parts of ice is added. The mixture thus cooled to about 0C is acidified with 16 to 18 parts of 30% hydrochloric acid. Diazotization is over within about 2 hours. Excess nitrous acid is destroyed as usual and the diazonium salt mixture is allowed to flow within ten minutes into a solution or suspension cooled to 0C of the coupling component of the formula:

three hours and the precipitated dye of the formula:

is filtered off, washed with little dilute sodium chloride solution and dried. About 26 parts of a red powder is obtained which dissolves in water with a red color and dyes polycaprolactam cloth yellowish red shades having excellent fastness properties. I

The dyes characterized in the following Table by their diazo and coupling components are prepared by a method analogous to that of Example 1, 2 or 53:

No. Diazo component Coupling component Shade CH N 3 CN NH 2 c H NH-R' Orange 3 O H so H (bright) 

1. A WATER-SOLUBLE ACID DYE WHICH IN THE FORM OF THE FREE ACID HAS THE FORMULA
 2. A dye as claimed in claim 1 of the formula:
 3. A dye as claimed in claim 1 of the formula
 4. A dye as claimed in claim 1 of the formula:
 5. A dye as claimed in claim 1 where Z is cyano.
 6. The dye of the formula
 7. The dye of the formula
 8. The dye of the formula 